Malicious PDF — malware analysis report

Static analysis result for SHA-256 8393d21685ef5423…

MALICIOUS

PDF

97.7 KB Created: 2021-08-03 00:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 413c4304e13dbad87b1e028dcf3b9063 SHA-1: cff07b0661fa5f5ba8a87ab55b71ae1109ce91db SHA-256: 8393d21685ef54238c3f6dabf5efd4e33eb583349449a108d582da5ca6e6f21d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious payloads or phishing pages. The file's structure and embedded links suggest an attempt to exploit users through deceptive content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81fda43e7---41589042226.pdf In PDF document text
    • https://accu-split.com/userfiles/files/62384258692.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12cbb6ef38---97890380960.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/85855223279.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u61a44jmnuv6bcdn8pf7hbeajn/16054531862.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16088389f9f0a7---bisulip.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/wawufuwosuwunoliguwen.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cad378a271db4d2d711f918283ad21d/74826251526.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/pexeno.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/wasisafatu.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/11170555566.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/9f68b52c8d88e7ee322beac56ee1d453/54074819024.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e24a5e81---xelakijufexamekuwutob.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/4d944cb0b00cce4148a27179de5d823a/rezopanen.pdfIn PDF document text
    • https://85097781.com/upload/files/72280326334.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/g0qj000eedu38uol63df3p5ted/gevoxo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d3199f159---8671841065.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/63340639223.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae6f5b5272---17676783980.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/podetivezomisilijisileje.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/beluduwenaxunekajexipu.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/51131558880.pdfIn PDF document text
    • https://aedwea.com/upload/foto/20572796524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=conversion+de+cm+a+pulgadasPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 17860 bytes
SHA-256: 1490bce764fe53a346f029256418ff3a7a7c4697345155deb4a58f0bc3442576
font_01_sfnt_off00014586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9D 10956 bytes
SHA-256: 831433ce716d17d46d3887c8f8b9ca61d7fe9b78571ebd38bc110c7273b0f833

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